Question

Child Health and Development Studies (CHDS) has been collecting data about expectant mothers in Oakland, CA since 1959. One of the measurements taken by CHDS is the weight increase (in pounds) for expectant mothers in the second trimester. In a fictitious study, suppose that CHDS finds the average weight increase in the second trimester is 14 pounds. Suppose also that, in 2015, a random sample of 40 expectant mothers have mean weight increase of 16 pounds in the second trimester, with a standard deviation of 6 pounds. At the 5% significance level, we can conduct a one-sided T-test to see if the mean weight increase in 2015 is greater than 14 pounds. Statistical software tells us that the p-value = 0.021.

Which of the following is the most appropriate conclusion?

- There is a 2.1% chance that a random sample of 40 expectant mothers will have a mean weight increase of 16 pounds or greater if the mean second trimester weight gain for all expectant mothers is 14 pounds.
- There is a 2.1% chance that mean second trimester weight gain for all expectant mothers is 14 pounds in 2015.
- There is a 2.1% chance that mean second trimester weight gain for all expectant mothers is 16 pounds in 2015.
- There is 2.1% chance that the population of expectant mothers will have a mean weight increase of 16 pounds or greater in 2015 if the mean second trimester weight gain for all expectant mothers was 14 pounds in 1959.

Answer #1

Here , We have ,

Sample size (n) = 40

Sample mean ( ) =16.

Stndard deviation (s) = 6

Hypothesis

Ho : = 14

Ha : > 14

This is a right tailed test.

Pvalue =0.021

Decision

Since Pvalue < significance level(0.05) So, rejects the null hypothesis.

Conclusion

Rejects the null Hypothesis & There is sufficient evidence to support the claim that the mean weight increase in 2015 is greater than 14 pounds.

Final conclusion

**There is a 2.1% chance that a random sample of 40
expectant mothers will have a mean weight increase of 16 pounds or
greater if the mean second trimester weight gain for all expectant
mothers is 14 pounds.**

Child Health and Development Studies (CHDS) has been collecting
data about expectant mothers in Oakland, CA since 1959. One of the
measurements taken by CHDS is the weight increase (in pounds) for
expectant mothers in the second trimester. In a fictitious study,
suppose that CHDS finds the average weight increase in the second
trimester is 14 pounds. Suppose also that, in 2015, a random sample
of 40 expectant mothers have mean weight increase of 16 pounds in
the second trimester,...

Child Health and Development Studies (CHDS) has been collecting
data about expectant mothers in Oakland, CA since 1959. One of the
measurements taken by CHDS is the weight increase (in pounds) for
expectant mothers in the second trimester. In a fictitious study,
suppose that CHDS finds the average weight increase in the second
trimester is 14 pounds. Suppose also that, in 2015, a random sample
of 35 expectant mothers have mean weight increase of 16.1 pounds in
the second trimester,...

Child Health and Development Studies (CHDS) has been collecting
data about expectant mothers in Oakland, CA since 1959. One of the
measurements taken by CHDS is the weight increase (in pounds) for
expectant mothers in the second trimester.
In a fictitious study, suppose that CHDS finds the average
weight increase in the second trimester is 14 pounds. Suppose also
that, in 2015, a random sample of 42 expectant mothers have mean
weight increase of 15.7 pounds in the second trimester,...

Child Health and Development Studies (CHDS) has been collecting
data about expectant mothers in Oakland, CA since 1959. One of the
measurements taken by CHDS is the age of first time expectant
mothers. Suppose that CHDS finds the average age for a first time
mother is 26 years old. Suppose also that, in 2015, a random sample
of 50 expectant mothers have mean age of 26.5 years old, with a
standard deviation of 1.9 years. At the 5% significance level,...

Question 5
Dean Halverson recently read that full-time college students
study 20 hours each week. She decides to do a study at her
university to see if there is evidence to show that this is not
true at her university. A random sample of 31 students were asked
to keep a diary of their activities over a period of several weeks.
It was found that the average number of hours that the 31 students
studied each week was 18.9 hours....

MATHEMATICS
1. The measure of location which is the most likely to
be
influenced by extreme values in the data set is the a. range
b.
median c. mode d. mean
2. If two events are independent, then a. they must be
mutually
exclusive b. the sum of their probabilities must be equal to one
c.
their intersection must be zero d. None of these alternatives
is
correct. any value between 0 to 1
3. Two events, A and B,...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 1 minute ago

asked 16 minutes ago

asked 17 minutes ago

asked 21 minutes ago

asked 26 minutes ago

asked 27 minutes ago

asked 47 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago